JP2007270748A - Submersible pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress catching of foreign matter on a jet discharge port 29 of a pump casing 3a, and stably to secure performance of an agitator 4 inside a pump tank 1, in a submersible pump device having the agitator 4 inside the pump tank 1 for discharging a jet from a submersible pump 3 to inside of the pump tank 1 and agitating the jet only for fixed time at the start of the operation of the submersible pump 3. <P>SOLUTION: In the submersible pump 3 comprising a centrifugal pump, out of a peripheral part of a pump chamber side opening end 29a in the jet discharge port 29 opened in the volute type pump casing 3a, a lower side half part 29b positioned in a pump discharge port 26 side is formed to have an arcuate face. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a submersible pump device installed in a water tank, and in particular, a submersible pump with a pump tank agitator that performs agitation by discharging a jet from the submersible pump into the water tank for a certain period of time when the submersible pump starts operation. Relates to the device.

  The agitation device in the pump tank attached to this type of submersible pump device discharges a jet for a certain period of time at the start of operation of the submersible pump and agitates the water tank, so that sand, sludge, floating oil, scum, etc. in the aquarium In this tank, sand or sludge accumulates or accumulates in the water tank, floats and fats and scum. Is prevented from adhering to the tank wall or the like, and the effect of cleaning the inside of the tank is obtained.

Conventionally, there are those disclosed in Patent Literature 1 and Patent Literature 2 as such an agitator in the tank. In the tank agitation apparatus according to Patent Documents 1 and 2, when the submersible pump starts operation, a jet flow from the submersible pump flows into the tank agitation apparatus, and the jet flow is discharged from the discharge port into the water tank. The inside of the water tank is agitated, and then the ball valve inside the tank agitator closes the discharge hole by the negative pressure of the jet and stops the ejection of the jet from the tank agitator.
Japanese Patent No. 3570861 CD-ROM of actual application No. 10-8965

  By the way, when this submersible pump apparatus with a stirring device in a pump tank is installed in a sewage tank, the foreign material contained in sewage may be inhaled in a pump casing at the time of starting of a submersible pump. When this foreign matter is supplied from the pump casing to the agitator in the tank together with the jet, the foreign matter is caught by the jet outlet of the pump casing and the jet outlet is closed, thereby ensuring the performance of the agitator in the tank. The problem that it is not possible arises.

  The present invention has been made in view of such a point, and an object of the present invention is to improve the structure of the jet outlet of the pump casing in the submersible pump device with the above-mentioned stirring device in the pump tank, thereby An object of the present invention is to stably secure the performance of the agitation device in the pump tank by suppressing the foreign matter from being caught at the outlet.

  In order to achieve the above object, according to the present invention, the pump chamber side opening end of the jet discharge port of the pump casing is formed by an arc surface, and the arc surface makes it difficult for foreign matter to be caught.

  Specifically, in the invention of claim 1, a submersible pump installed in the aquarium and a part or all of the jet flow from the submersible pump attached to the submersible pump for a certain period of time when the submersible pump starts operation. A submersible pump device provided with a pump tank stirring device that discharges the water into the water tank and performs stirring in the water tank is an object.

  And the said submersible pump is provided with the pump casing which has a pump chamber which accommodates an impeller, The jet outlet which discharges a jet flow to the said stirring apparatus is opened in this pump casing, The pump in this jet outlet The peripheral edge of the chamber-side opening end is formed by a circular arc surface having a circular arc cross section.

  According to the configuration of the first aspect of the present invention, a part or all of the jet is discharged from the jet outlet in the pump casing into the water tank for a certain period of time when the submersible pump starts operation by the pump tank agitator. The water tank is agitated by the jet. At that time, since the peripheral edge of the opening end on the pump chamber side in the jet discharge port is an arc surface having a circular arc cross section, foreign matter in the water tank is sucked into the pump chamber in the pump casing of the submersible pump in the discharge state of the jet. Even so, the foreign matter is less likely to be caught on the peripheral edge portion of the opening end on the pump chamber side formed by the arc surface of the jet discharge port, and even if it is caught, the foreign matter is easily removed. Therefore, the jet discharge port is not blocked by foreign matter, and the performance of the agitation device in the pump tank that discharges the jet flow from the jet discharge port into the water tank and stirs the inside of the water tank can be stably obtained.

  In the second aspect of the invention, as in the first aspect of the invention, the submersible pump installed in the water tank and the submersible pump attached to the submersible pump, and a jet flow from the submersible pump for a certain period of time when the submersible pump starts operation. A submersible pump device including a pump tank stirring device that discharges a part or all of the water into the water tank and performs stirring in the water tank is an object.

  And the said submersible pump shall consist of a centrifugal pump provided with the spiral pump casing which has a pump chamber which accommodates an impeller. The pump casing is provided with a pump discharge port and a jet discharge port that is disposed in the vicinity of the upstream side of the pump chamber water flow of the pump discharge port and discharges the jet flow to the agitator. The downstream part located in the said pump discharge port side among the peripheral parts of the pump chamber side opening end is comprised by the circular arc surface of cross-section circular arc shape, It is characterized by the above-mentioned.

  According to the configuration of the invention of claim 2, a part or all of the jet flow from the jet discharge outlet in the spiral pump casing is only a certain time at the start of operation of the submersible pump consisting of the centrifugal pump by the stirring device in the pump tank. The water tank is agitated by this jet. At that time, the downstream portion located on the pump discharge port side in the peripheral portion of the pump chamber side opening end in the jet discharge port opening near the upstream side of the pump chamber water flow of the pump discharge port is an arc surface. Even if foreign matter in the water tank is sucked into the submersible pump, the foreign matter is difficult to be caught on the downstream side portion formed by the arc surface of the peripheral edge of the pump chamber side of the jet discharge port, and it is easy to come off even if it is caught. Become. Therefore, the jet discharge port is not blocked by foreign matter, and the performance of the agitation device in the pump tank that discharges the jet flow from the jet discharge port into the water tank and stirs the inside of the water tank can be stably obtained.

  Moreover, since only the downstream part located in the pump discharge port side among the peripheral parts of the pump chamber side opening end in a jet discharge port is an arc surface, the whole pump chamber side opening end peripheral part of the said jet discharge port is circular arc surface As compared with the case, the vibration of the impeller and the power loss of the pump can be reduced.

  According to a third aspect of the present invention, in the submersible pump device according to the second aspect of the present invention, the arc surface of the peripheral edge of the pump chamber side opening end at the jet discharge port is directed upstream toward the opposite side of the pump discharge port. It is assumed that the radius of curvature gradually decreases.

  According to the invention of claim 3, the radius of curvature of the arc surface of the peripheral edge of the pump chamber side opening end at the jet outlet changes so as to gradually decrease from the downstream side toward the upstream side, and the foreign matter is further caught. Can be difficult.

  As described above, according to the first aspect of the present invention, in the submersible pump apparatus including the agitation device in the pump tank that discharges the jet flow from the submersible pump into the water tank for a certain period of time when the submersible pump starts operation. The peripheral edge of the pump chamber side opening end at the jet discharge opening that opens in the pump casing was an arc surface. Further, in the invention of claim 2, the downstream portion located on the pump discharge port side in the peripheral portion of the pump chamber side opening end in the jet discharge port that opens in the spiral pump casing of the submersible pump comprising the centrifugal pump is an arc surface. It was. According to these inventions, it is possible to prevent the foreign matter sucked into the submersible pump from being caught by the peripheral edge of the pump chamber side opening end at the jet discharge port and closing the jet discharge port. The performance of can be obtained stably. In particular, according to the second aspect of the present invention, only the downstream portion located on the pump discharge port side in the peripheral portion of the pump chamber side opening end in the jet discharge port is formed into an arc surface, so that the pump chamber of the jet discharge port is provided. Compared with the case where the entire peripheral edge of the side opening end is a circular arc surface, it is possible to reduce the vibration of the impeller and the power loss of the pump.

  According to the invention of claim 3, by setting the arc surface of the downstream portion of the peripheral edge of the pump chamber side opening end at the jet discharge port to an arc surface with a gradually decreasing radius of curvature toward the upstream side, It is possible to further prevent the foreign matter from being caught.

  Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

  In FIG. 1, 1 is a sewage relay pump tank as a water tank having an inlet 5 and a manhole 11, and 2 is a submersible pump apparatus according to an embodiment of the present invention in which a tank agitator 4 is attached to a submersible pump 3. The submersible pump 3 has an electric motor 3b, and the sewage that has flowed into the pump tank 1 from the inflow port 5 has a water level lower than a predetermined operation level until the water level drops to a predetermined stop level. After being sucked into the submersible pump device 2 by the operation of the submersible pump device 2 by the operation of the motor 3b, it is discharged from the fixed discharge pipe 6. In order to control the operation of the submersible pump device 2, an operation float switch 7, a stop float switch 8 and an abnormal water level alarm float switch 9 are provided in the pump tank 1, and a control panel 10 is provided above the pump tank 1. Is provided.

  The submersible pump device 2 is lowered from the manhole 11 of the sewage relay pump tank 1 to the bottom of the tank through the guide pipe 12, and is detachably installed on the sewage relay pump tank 1 by the attaching / detaching device 13. For raising and lowering the submersible pump device 2, the lid 14 of the manhole 11 and the submersible pump 3 are connected by a raising and lowering chain 15. The lifting chain 15 is connected to the top surface of the submersible pump 3 on a vertical line passing through the center of gravity of the submersible pump device 2. The detachable device 13 couples the submersible pump device 2 to a fixed discharge pipe 6 fixed in the pump tank 1, and the submersible pump device 2 is supported by the fixed discharge pipe 6 by this connection.

  That is, as shown in FIG. 2, the attachment / detachment device 13 includes an attachment / detachment connecting pipe 22 having an attachment / detachment flange part 16 and a hook 17 provided in a pump discharge pipe part 25 in a pump casing 3a of the submersible pump 3, and a fixed discharge. A proximal end flange portion 18 of the pipe 6 is formed. The hook 17 forms an engaging recess opening downward with the upper portion of the detachable flange portion 16, and an engaging portion 18 a that fits into the engaging recess is formed on the upper portion of the proximal flange portion 18 of the fixed discharge pipe 6. Is formed. The submerged pump device 2 is supported by the fixed discharge pipe 6 by the engagement between the engaging recess and the engaging portion 18 a, and the detachable flange portion 16 is attached to the proximal flange portion of the fixed discharge pipe 6 by the weight of the submersible pump device 2. The moment which presses to 18 acts, and both are connected without gap. On the mutual contact surfaces of the hook 17 and the engaging portion 18a, a taper for guiding the fitting and for connecting the flange portions 16 and 18 closely is formed.

  3, the pump casing 3a of the submersible pump 3 is integrally formed with a pump discharge pipe portion 25 protruding laterally, and the detachable connection pipe is formed at the tip of the pump discharge pipe portion 25. 22 is attached. The detachable connecting pipe 22 is provided with the detachable flange portion 16 and a guide 23 slidably engaged with the guide pipe 12. There are two guide pipes 12, and two guides 23 are provided on the connecting / disconnecting pipe 22.

  As shown in FIGS. 3 and 4, the submersible pump 3 is a centrifugal pump, and the pump casing 3a is a spiral pump casing having a pump chamber 27 that houses an impeller (not shown). A suction port 30 is opened at the lower part of the pump casing 3a. The pump discharge pipe portion 25 is formed integrally with the pump casing 3 a, and a pump discharge port 26 communicating with the pump chamber 27 is opened in the pump discharge pipe portion 25. When the submersible pump device 2 (the pump discharge pipe portion 25 of the pump casing 3a in the submersible pump 3) is coupled to the fixed discharge pipe 6 by the detachable device 13, the pump discharge port 26 is connected to the inside of the fixed discharge pipe 6. Communicate.

  As shown in FIGS. 3 and 5, the pump casing 3a has an upstream side of the water flow in the pump chamber indicated by an arrow in FIG. 5 (reverse to the pump discharge port 26 in the pump discharge pipe portion 25). A jet discharge pipe portion 28 is integrally formed in the vicinity of the clockwise direction), and a jet discharge port 29 for discharging the jet flow from the pump chamber 27 to the tank agitator 4 is opened in the jet discharge pipe portion 28. .

  The agitation device 4 in the tank discharges part or all of the discharge flow of the submersible pump 3 into the tank when the operation of the submersible pump device 2 is started. As shown in FIGS. 3 and 4, the casing 31 of the tank agitation device 4 is coupled to the casing body 45 attached to the pump casing 3 a of the submersible pump 3 at the jet discharge pipe portion 28, and the lower side thereof. A diaphragm cover 46 is provided, and a protective cover 47 is provided above the casing body 45.

  As shown in the figure, in the casing 31 including the casing body 45 and the diaphragm cover 46, an upper valve accommodating portion 51 that accommodates the ball valve 49 and oil as a lower working fluid are accommodated by the lower diaphragm 48. A compartment is formed in the lower oil chamber 52. The lower diaphragm 48 is made of, for example, rubber, and a peripheral portion thereof is sandwiched between the casing body 45 and the diaphragm cover 46.

  On the other hand, a recess is formed at the top of the casing body 45, and the periphery of the upper diaphragm 53 made of, for example, rubber is sandwiched between the periphery of the recess and the protective cover 47, so that the casing body 45 The upper oil chamber 54 is formed by the recess and the upper diaphragm 53. The protective cover 47 protects the upper diaphragm 53.

  The lower oil chamber 52 and the upper oil chamber 54 communicate with each other by an oil passage 55 formed in the casing body 45, the diaphragm cover 46, and the lower diaphragm 48, and an adjustment valve 56 that adjusts the oil flow rate of the oil passage 55 to the diaphragm cover 46. Is attached.

  In the upper part of the casing main body 45, an inflow portion 32 is provided for introducing a jet discharged from the jet outlet 29 in the pump casing 3 a of the submersible pump 3 into the casing main body 45. The casing body 45 is attached to the pump casing 3a of the submersible pump 3 by fastening a flange 32a formed at the upstream end of the inflow portion 32 of the casing body 45 to the end face of the jet discharge pipe portion 28 of the pump casing 3a. A flow passage 57 for communicating the pump chamber 27 of the submersible pump 3 and the valve accommodating portion 51 is formed inside the inflow portion 32, and the pump of the submersible pump 3 is connected via the jet passage 57. A jet flows from the jet outlet 29 of the casing 3a into the valve accommodating part 51.

  On the other hand, on the opposite side of the inflow part 32 in the upper part of the casing main body 45, a discharge part 33 for allowing the jet flow flowing in from the inflow part 32 to flow out is provided. The discharge portion 33 includes an ejector mechanism 34 that generates an ejector effect by a jet flowing inside, and a nozzle 35 having a discharge port 36 that discharges the jet flow that has passed through the ejector mechanism 34 into the pump tank 1. 35 is attached to the downstream end of the ejector mechanism 34.

  The ejector mechanism 34 has an outflow hole 58 through which the jet flow flows out from the valve housing portion 51, and a valve seat 59 on which a ball valve 49 can be seated is formed at the upstream end of the outflow hole 58. Is provided. In the ejector mechanism 34 configured in this way, the flow velocity of the jet flow increases and the static pressure decreases as the jet flow in the valve accommodating portion 51 passes through the inside.

  The diaphragm cover 46 constitutes the bottom wall of the casing 31, and this bottom wall is formed in a convex curved shape projecting downward so as to accommodate the lower diaphragm 48 along the bottom wall. Then, around the bottom wall, there are provided three legs 62, 62 constituting an installation part for allowing the in-vessel stirring device 4 to stand on a flat surface (only one is shown in FIG. 4). .

  A bulging portion that bulges downward and extends between the upper part of the leg 62 and the convex curved bottom wall is formed inside one leg 62 of the three legs 62, 62. A mounting portion 63 of the regulating valve 56 is formed by 62 and the bulging portion. That is, an adjustment valve attachment hole extending from the outer surface of the leg 62 to the bulging portion is formed, and the adjustment valve 56 is screwed into the attachment hole.

  As a feature of the present invention, as shown in FIGS. 5 and 7 to 9, the pump discharge port 26 side of the peripheral portion of the pump chamber side opening end 29 a in the jet discharge port 29 of the pump casing 3 a of the submersible pump 3 is provided. The downstream half part 29b located in the section is formed by a circular arc surface having a circular arc cross section. The arcuate surface of the downstream half 29b is located on the opposite side of the pump discharge port 26 from the maximum radius of curvature r1 of the arcuate surface at the downstream end, as shown in an enlarged view in FIGS. It is comprised by the circular arc surface where a curvature radius becomes small gradually toward an upstream side. For example, the radius of curvature r1 at the downstream end of the arc surface is r1 = 10 mm as shown in FIG. 7, and the radius of curvature r2 of the arc surface at a position shifted by 30 ° from the downstream end in the circumferential direction is shown in FIG. As shown in FIG. 9, r2 = 8 mm, and the radius of curvature r3 of the arc surface at a position shifted from the downstream end by 60 ° in the circumferential direction is r3 = 5 mm as shown in FIG.

  Next, the operation of the submersible pump device 2 of the above embodiment will be described. Before the submersible pump 3 is started, as shown by a solid line in FIG. 4, the ball valve 49 in the tank agitation device 4 is on the lower diaphragm 48 below the valve housing 51, and the outflow hole 58 and the discharge port 36 are In an open state. When the submersible pump 3 is activated by the operation of the motor 3b in this state, sewage is sucked into the pump chamber 27 from the suction port 30 of the pump casing 3a by rotation of the impeller, and a part of the sewage is stirred from the jet discharge port 29 into the tank. It flows into the valve accommodating part 51 through the jet passage 57 of the device 4 and is ejected from the discharge port 36 of the nozzle 35 into the pump tank 1 through the outflow hole 58 of the ejector mechanism 34. Thereby, the inside of the pump tank 1 is stirred.

  Then, when sewage passes through the outlet hole 58 of the ejector mechanism 34 from the valve accommodating portion 51, a negative pressure is generated in the valve accommodating portion 51, and oil is transferred from the upper oil chamber 54 to the lower oil chamber 52 by this negative pressure. In accordance with the movement, the upper diaphragm 53 is lowered and the lower diaphragm 48 is biased so as to expand upward, and the ball valve 49 on the upper diaphragm 53 starts to be pushed up.

  When about 20 to 50 seconds elapse from the start of operation, as shown by the phantom line in FIG. 4, the lower diaphragm 48 is completely inflated and protrudes upward, and the ball valve 49 is pushed up by the lower diaphragm 48. It sits on the valve seat 59 and closes the outflow hole 58 (discharge port 36). As a result, the discharge of sewage from the nozzle 35 is stopped, and the sewage is pumped to the fixed discharge pipe 6 through the pump discharge pipe portion 25 (pump discharge port 26) and the attachment / detachment connection pipe 22. When the ball valve 49 is pressed against the valve seat 59, the inside of the valve housing 51 becomes positive pressure, and the upper diaphragm 53, the lower diaphragm 48, and the oil return to the state before the pump is started.

  At that time, in the pump casing 3 a of the submersible pump 3, the pump among the peripheral portion of the pump chamber side opening end 29 a in the jet discharge port 29 that opens near the upstream side of the pump chamber water flow from the pump discharge port 26. Since the downstream half portion 29b located on the discharge port 26 side is an arc surface, even if foreign matter in the pump tank 1 is sucked into the submersible pump 3, the foreign matter remains at the opening end on the pump chamber side in the jet discharge port 29. It becomes difficult to get caught in the downstream half part 29b which consists of a circular arc surface of the peripheral part of 29a. Not only that, even if the foreign matter is caught on the downstream half 29b of the peripheral edge of the pump chamber side opening end 29a, the foreign matter is easily removed. For example, the foreign matter comes off at the moment when the ball valve 49 is seated on the valve seat 59 and the discharge port 36 is closed, and further, if the submersible pump 3 is stopped and then restarted, the caught foreign matter comes off. As a result, the jet outlet 29 is not blocked by foreign matter, and the performance of the agitation device 4 in the pump tank in which the jet is discharged from the jet outlet 29 into the pump tank 1 and the pump tank 1 is stirred is stable. Is obtained.

  In addition, since only the downstream half 29b located on the pump discharge port 26 side is a circular arc surface among the peripheral portions of the pump chamber side opening end 29a in the jet discharge port 29, the peripheral edge of the pump chamber side opening end 29a. The vibration of the impeller of the submersible pump 3 and the power loss of the submersible pump 3 can be reduced as compared with the case where the entire part (entire circumference) is an arc surface.

  Moreover, since the arc surface of the downstream half 29b of the peripheral edge of the pump chamber side opening end 29a in the jet discharge port 29 is an arc surface with a gradually decreasing radius of curvature toward the upstream side, the pump Foreign matter is less likely to be caught on the chamber-side opening end 29a.

  The foreign matter is ejected together with the jet flow from the discharge port 36 of the nozzle 35 into the pump tank 1 through the jet discharge port 29 and the tank stirring device 4, or the pump discharge pipe portion 25 (pump discharge port 26) and The sewage is pumped together with the sewage through the attachment / detachment connection pipe 22.

  On the other hand, when the operation of the submersible pump device 2 is stopped, the ball valve 49 is detached from the valve seat 59 and falls onto the lower diaphragm 48. The time from the start of operation until the ball valve 49 closes the outflow hole 58 can be adjusted by the adjusting valve 56.

  By such an operation of the tank agitator 4, sand, sludge, floating oil and fat, scum and the like in the pump tank 1 are agitated by the jet flow and sucked into the pump 3 and then discharged from the fixed discharge pipe 6. For this reason, it is suppressed that sand or sludge stays or accumulates in the water tank, and floating oil or fat or scum adheres to the tank wall or the like.

  Further, when the sewage in the pump tank 1 is agitated, the sewage near the water surface is also agitated, so that oxygen is actively supplied from the atmosphere and aeration is promoted.

(Other embodiments)
In the above embodiment, the radius of curvature of the downstream half 29b of the peripheral edge of the pump chamber side opening end 29a of the jet discharge port 29 of the pump casing 3a of the submersible pump 3 gradually decreases toward the upstream side. However, the downstream half 29b may be an arc surface having the same radius of curvature. Further, only the downstream end portion of the peripheral edge portion of the pump chamber side opening end 29a may be partially formed as an arc surface, and the same effect as the above embodiment can be obtained.

  Moreover, in the said embodiment, although the downstream half part 29b of the peripheral part of the pump chamber side opening end 29a in the jet discharge outlet 29 of the pump casing 3a is made into the circular arc surface, the pump chamber side opening of the jet discharge outlet 29 is carried out. It is good also considering the edge 29a as a circular arc surface over the whole peripheral part.

  Moreover, in the said embodiment, although the water level sensor using the float switches 7-9 is employ | adopted for the operation | movement of the submersible pump apparatus 2, in a water tank using the tank stirring apparatus 4, a float switch is swung by a water flow. Therefore, it is more desirable to use a pressure type sensor such as a bubble type in order to avoid erroneous detection.

  The present invention relates to a submersible pump device with an agitator in a tank, and prevents the foreign matter sucked into the pump from being caught on the peripheral edge of the pump chamber side opening end of the jet discharge port and blocking the jet discharge port. Since the performance of the agitator in the tank can be obtained stably, it is extremely useful and has high industrial applicability.

FIG. 1 is a cross-sectional view showing the overall configuration of the sewage pump facility. FIG. 2 is a side view of the submersible pump device according to the embodiment of the present invention with a part of the installation state in the water tank omitted. FIG. 3 is a plan view of the submersible pump device. 4 is a cross-sectional view taken along line IV-IV in FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is an enlarged view in the VI-VI direction of FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 9 is a cross-sectional view taken along line IX-IX in FIG.

Explanation of symbols

1 Sewage relay pump tank (water tank)
2 Submersible pump device 3 Submersible pump 3a Pump casing 4 Stirrer in tank 25 Pump discharge pipe (discharge pipe)
26 Pump discharge port 27 Pump chamber 28 Jet discharge tube portion 29 Jet discharge port 29a Pump chamber side open end 29b Downstream half r1-r3 Arc surface radius of curvature 34 Ejector mechanism

Claims (3)

A submersible pump installed in the aquarium, and attached to the submersible pump, a part or all of the jet from the submersible pump is discharged into the aquarium for a certain period of time when the submersible pump is started to agitate the aquarium A submersible pump device comprising a pump tank agitator,
The submersible pump includes a pump casing having a pump chamber that houses an impeller,
In the pump casing, a jet outlet for discharging a jet to the agitator is opened,
The submersible pump device characterized in that a peripheral portion of the pump chamber side opening end of the jet discharge port is formed by a circular arc surface having a circular arc cross section. A submersible pump installed in the aquarium, and attached to the submersible pump, a part or all of the jet from the submersible pump is discharged into the aquarium for a certain period of time when the submersible pump is started to agitate the aquarium A submersible pump device comprising a pump tank agitator,
The submersible pump consists of a centrifugal pump with a spiral pump casing having a pump chamber that houses an impeller,
The pump casing is provided with a pump discharge port and a jet discharge port that is disposed in the vicinity of the upstream side of the pump chamber water flow of the pump discharge port and discharges the jet to the agitator.
The submersible pump device characterized in that the downstream portion located on the pump discharge port side in the peripheral portion of the pump chamber side opening end in the jet discharge port is configured by an arc surface having a circular arc cross section. The submersible pump device according to claim 2,
A submersible pump device characterized in that the arc surface of the peripheral edge of the pump chamber side opening end in the jet discharge port has a radius of curvature that gradually decreases toward the upstream side located on the opposite side of the pump discharge port.

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